We have an Nikon Camera and when I plug it into a usb port, it shows up as a Nikon camera on the usb port. However, it does not map a drive to f: as it should. The camera does work on other pc's, it does show up as a mass storage device. It does not on the pc I need it to work on. I am running windows xp with sp2. Other devices, Blackberry for example, work fine. I was told by Nikon that I do not need a driver to download for this. Also, I think PTP would work as a workaround, but I would like to get it to work as it did. It did work 2 weeks ago.